摘要 |
A digital communication system, in which digital information is represented by a quaternary information symbol (11, 01, 00, 10) and the double step phase shift, each step represented by ( pi /4, 3 pi /4, 5 pi /4, 7 pi /4), is performed per 1/2 time slot in correspondence to each information symbol, so that the number of phase shift per unit time in the case of the identical transmission rate can be decreased to 1/2, as compared with a DELTA theta /2-DSK system, and expansion of the bandwidth can be decreased to 1/2.
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申请人 |
IKEGAMI, FUMIO;MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
IKEGAMI, FUMIO;YOSHIDA, SUSUMU;TAKEUCHI, TSUTOMU;ARIYAVISITAKUL, SIRIKIAT |